Behind The Counter Blues Week of April 28B.B. & The Charioteers KingSwing Low Sweet Chariot--Beverly Records--$,' 39.99Blues BrothersBriefcase Full Of Blues--Beverly Records--$,' 24.99Fred McdowellMississippi Delta Blues--Beverly Records--$,' 24.99Taj MahalHappy To Be Just Like I Am--Beverly Records--$,' 14.99All Behind the Counter Specials >This Week's Top 50--Beverly Records--$,' 34.98Neighborhood Favs--Beverly Records--$,' 24.98RSD Overstock--Beverly Records--$,' 14.99Indie Exclusives--Beverly Records--$,' 29.98Local Record Shops Only